运用jQuery写的验证表单(实例讲解)

仲崇峰

2019-05-05

//运用jQuery写的验证表单

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <title></title>
  <script src="js/jquery-1.3.1.js"></script>
  <script src="js/lib/jquery.validate.js"></script>
  <script src="js/lib/jquery.validate.messages_cn.js"></script>
  <style>
    body {
      font: 12px/19px Arial, Helvetica, sans-serif;
      color: #666;
    }

    form div {
      margin: 5px 0;
    }

    .int label {
      float: left;
      width: 100px;
      text-align: right;
    }

    .int input {
      padding: 1px 1px;
      border: 1px solid #ccc;
      height: 16px;
    }

    .sub {
      padding-left: 100px;
    }

    .sub input {
      margin-right: 10px;
    }

    .formtips {
      width: 200px;
      margin: 2px;
      padding: 2px;
    }

    .onError {
      background: #FFE0E9 url(images/reg3.gif) no-repeat 0 center;
      padding-left: 25px;
    }

    .onSuccess {
      background: #E9FBEB url(images/reg4.gif) no-repeat 0 center;
      padding-left: 25px;
    }

    .high {
      color: red;
    }
  </style>
  <script>
    $(function () {
      $("form :input.required").each(function () {
        var $required = $("<strong class='high'>*</strong>");
        $(this).parent().append($required);
      })
      $("form :input").blur(function () {
        var $parent = $(this).parent();
        $(".formtips").remove();
        if ($(this).is("#username")) {
          if (this.value == '' || this.value.length < 6) {
            var errmsg = '请输入正确的格式.';
            $parent.append('<span class="formtips onError">' + errmsg + '</span>')
          } else {
            var sucssemsg = '格式输入正确';
            $parent.append('<span class="formtips onSuccess">' + sucssemsg + '</span>')
          }
        }
        if ($(this).is("#email")) {
          //邮箱格式正则表达式的用法
          if (this.value == '' || ( this.value != "" && !/.+@.+\.[a-zA-Z]{2,4}$/.test(this.value) )) {
            var errmsg = '请输入正确的格式.';
            $parent.append('<span class="formtips onError">' + errmsg + '</span>')
          } else {
            var sucssemsg = '格式输入正确';
            $parent.append('<span class="formtips onSuccess">' + sucssemsg + '</span>')
          }
        }
      })
      $("#send").click(function () {
          var onerr = $(this).parent().siblings().children().hasClass("onError");//出错就会添加class为onerror的元素
          if(onerr) {
            return false;
          } else {
            alert("你已经注册成功了");
          }
        }
      )
      $("#reset").click(function () {
        $(".formtips").remove();
      })
    })
  </script>
</head>
<body>

<form method="post" action="">
  <div class="int">
    <label for="username">用户名:</label>
    <input type="text" id="username" class="required"/>
  </div>
  <div class="int">
    <label for="email">邮箱:</label>
    <input type="text" id="email" class="required"/>
  </div>
  <div class="int">
    <label for="personinfo">个人资料:</label>
    <input type="text" id="personinfo"/>
  </div>
  <div class="sub">
    <input type="submit" value="提交" id="send"/><input type="reset" id="res"/>
  </div>
</form>

</body>
</html>

jquery 表单验证